James p



(No Model.)

J. P. MQELROY.

SYSTEM 0E ELECTRIC DISTRIBUTION. No. 366,124. Patent-ed July 5, 1887.

N. PETERS. Phalolhhalmphar, Walhniun, D. C.

UNITED STATES PATENT OEE-TCE.

JAMES F. MCELROY, OF LANSING, MICHIGAN, ASSIGNOR OF ONE-HALF TO LEWIS O. BUTLER, OF SAME PLACE.

SYSTEM OF ELECTRIC DISTRIBUTION.

v SPECIFICATION forming part of Letters Patent No. 366,124, dated July 5, 1887. i

Application tiled February 3, 1887. Serial No. 226,883. (No model.)

To c/.ZZ whom if; may concern:

Beit known that I, JAMES F. McELRoY, of Lansing, in the county of Ingham and State of Michigan, have invented new and useful Improvements in Systems of Electric Distribution; and I do hereby declare that the following is a full, clear,and exact description thereof, reference bein g had to the accompanying drawings, which form a part of this specification.

This invention relates to a new and useful improvement for a system of electrical distribution for lighting; and the invent-ion consists in theY novel manner of arranging the local lam p-circuits so that a lamp (or group oflamps) I the lamp itself, asin the ordinary manner, and one at a more distant station-all in the manner and for the purpose hereinafter explained.

In the drawings which accompany this specification, Figure l is a diagram of my improved system. Fig. 2 is a plan of the switch, and Fig. 3 is a central section thereof.

A represents the positive and B the negative main conductors of an electrical supply.

C is a lamp (or group of lamps) located in the room or station D.

` E F are positive and negative service-conductors for the lamp C, and E F are duplicate positive and negative service-conductors for the same lamp, butin a room or station, S, distant from the lamp C.

I is the lamp-circuit arranged between the two stations, `and G and H are two manual switchesone in the room D and the other at the distant station S. Each of these switches hastwo liXed contacts, which are the terminals ofthe respective service-conductors, and one movable contact formed by the respective terminal of the lampcircuit, all so arranged that by placing t-he movable contact ofeither switch in electrical connection with either the positive or negative service-conductor the light may be turned on or off at will. The switches should be so constructed that the movable contact is always electrically connected with one of the two fixed contacts, and in Figs. 2 and 3 such aswitch is shown in detail, and is arranged as follows: An insulating-case, a, is provided with a central spindle, b, suitably 5e journaled therein. This spindle carries asuitable button, c, for turning it by hand, and has is controlled by two manual switches-one near secured to it the metallic spring d. The inner walls of the case around the spindle are formed in two cylindrical halves, but each half is eccentrcally disposed Vto the other and to the spindle, so as to be separated by radial oitsets 0r shoulders m m. The upper portions of each of these cylindrical halves is provided with a metallic lining, e, electrically disconnected from each other and provided with top 6o flanges, h, to which the terminals of the positive and negative service-conductors are respectively' secured. The lower portion of each ofthese cylindrical halves is similarly provided with a metallic lining, f, electrically discony nected from the metallic linings e, but electri'cally connected with each other by the bottom lining, `f/,to which the terminal ofthelampcircuit is secured. The spring l i'n any of its positions is always in electrical contact with 7o one of the upper and one of the lower metallic linings, of, and thus the lamp-circuit is always in electrical connection with one of its serviceconductors. It' the spindle b is turned to the right, a click of the spring d tells the operator 'that the lamp-connection is changed from one service-conductor to the other. The offsets m. also prevent the short-ci rcuiting of the serviceconductors.

The advantage of my improved system may 8o be best illustrated by a special application thereof. Suppose the station D represents the office-room and the station S the residence of the executive officer of an institution provided with an electric-light plant. It will be seen I that ifthe installation is made on the plan described the officer will be able to turn on the light in his office from his residence, and thus be saved the inconvenience of entering the dark ofiice, and upon leaving his oflice he can 9o turn ott the light without going back to his residence. If the lamp at his residence is in a similar circuit, he can turn on thelamp at his residence when he Wants to repair thereto from his olIice. It will be seen that this system of electrical distribution may be applied' to other translating devices where it is desirable to obtain similar advantages ofcontrol from two stations.

Vhat I claim as my invention is- 1.-Ihc combination of a local lamp-circuit having one of its terminals at the local station ICO and the other at a more distant station7 a positive and a negative service-conductor for each terminal of said circuit, and a manual switch at cach terininal ol' the lamp-circuit arranged to electrically connect said terminal with either the positive or negative serviceeonductor, substantially as described.

2. Thecon1bination,with alocallainpcircuit having its terminals at two different stations7 of a positive and a negative servieeconductor therefor at each station and of a manual switch at each station, each arranged to connect the lainpcircuit either with the positive or with the negative serviceconductor, substantially as described.

3. The eon1bination,witl1 an electric circuit having; a translating device in multiple are with the inain comluctors, cfa positive and a the spindle, all arranged and connected snb- 3o stant-ially as described.

JAMES F. hic/EL tOY.

Vitnesses:

LUTHER T. ANDERSON, L. C. BUTLER. 

